Piston-ring and mounting therefor



A. K, SCHAAP.

PISTON RING AND MOUNTING THEREFOR.

APPLICATION FILED JUNE 26, I918.

' 1 357,729, Patented Nov. 2, 1920..

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o W n m l IANDER "K. SG'HAA'E, OF NEW YOEK,

I l. EL, asslsnon TO EVA 0 SCEIAAP. or

Application filed June 25,

To (177 E f/Elm i/I may concern:

lie it known that l. iii nrmnnnn lei. Scum r, a citizen of the l nitetl States, and a resident of the city of li'ew York, county of Kings and State of New York. have invented a new and useful lni 'iroveinent in Piston-Rings and h'lou'iitings 'lhere'for of' which the folli'iwing is a specification. The object of my invention is to provide a device of this class in which a novel "form of piston ring is mounted in a new way so as to insure a tight joint under all conditions of service and thereby prevent anjil leakage of lubricating oil into the combustion charm her at any time even though the crank case be supplied with more than its normal sup an. x

This andnther objects are accomplished by my invention. one embodiment of which is hereinafter set forth. v

For a more particular description of my invention reference is to he had'to the accompanying drawings, in Which- Figure, l is a plan view of one side of the joint of my improved ring.

Fin. 2 shows one end of this ring at the l'l llli of Fig. l.

.liigr. $5 shows one end looking outwardly. the "view being; taken at right angles to that of l ig. 2.

Fig.5; l-

a side elevation of the exterior of the ioi .t. I

Fig. is an inverse plan View and shows the opposite side fr in. that shown in Fig. .l.

l'i b shows the end at the right of the end w gs? and S are sectional views taken through my improviul rim? and a cylinder and piston so as to show the operation of the ri 7 showing how a liquid seal is formed on the down stroke o f the piston. 2 id how the seal acts on the up 1" l 3H". iii ieliu the various vieu 's oi the in '1' reference characters desig- Matti) milar parts.

My improved ring; I. is placed in a piston 53 and rubs against the cylinder wall I; which is never perfectly regular but mav he as nearly o as such structures can be made by i l" or otherwise.

ring i is one piece ring with two consul llaeh end has a flat opted to engage a corrcspondingr he other end. and two ol't set bev- Specification of Letters Patent.

latented Nov. 2, 15320.

1918. Serial N0. 242,016.

cled edges 7 and S at right. angles to the sur' face (3 which are so arranged that a surface '4' is close to a surface S on the other end. These surfaces are made so as to he closest at the outer surface of the ring and diverge slightly toward the interior of the ring". it will he noted that these beveled surfaces are set at diii'erent angles in the respective ends in the embodiment shown, but this is not essential.

When the ring 1 is in place in a groove 9 of the piston 2. lubricating oil it) is splashed between the cylinder and piston in the conventional way but does not get by the piston ring 1 inany undesirable amount because as this piston rises and falls. the cylinder walls are'ruhbed by the ring which must expand and contract to a i'united extent because of irregularities in the cylinder wall. This expansion and contraction causes a corrcspomlingg; separation and approaching of the surfaces 7 and which are never separated enough to overcome the capillary action of the lubricating oil ll) which is between them. But, as these surfaces diverge, as the oil passes inwardly. oil is first sucked in from the cylinder wall and then passed inwardly to the back of the riu' l where it accumulates and reinforces the rin g so as to hold it against the cylinder wall and keeps the piston away from the all. The. excess oil escapes on the down or suction stroke when the ring is against. the upper edge of thepgioox'e as shown in Fig. T. ()n the compression stroke this ring); is at the bottom of the groove but the pressure on top keeps'the oil down so none escapes. The internal pressure of the. oil is not suflicicut at any time to overcome the capillary action and force the oil outwardly between the couvergzin o; surfaces 7 and 8 and these surfaces and the surfaces 6 force this oil inwardly while niaintaing alight joint.

in view of the foregoing. it is apparent that a tight joint is maintained at all times liietwecu the ends l and 5 with a liquid seal always iresent between the surfaces T and 8 when the device is in use, and the ring 1 is always snugagainst the. cylinder wall 3 with a tight. sliding fit.

il'hile l have shown one embodiment. of my invention, it is obvious that it is not restricted thereto but is broad enough to cover all structures that come within the scope of the annexed claims.

joint between the at all times.

What I claim isp 1. In a device of the class described, a piston, a cylinder wall and a packing ring with ends converging as the exterior surface is approached and a liquid seal between the piston ring and piston which is maintained by the pressure exerted by the converging ends of the ring, whereby a tight piston and cylinder exists 2. A piston ring having ends with overlapping and converging surfaces which extend continuously and diagonally from the router to the inner surfaces ofthe ring withthe opening wider at the interior than at the exterior so that vhen the ring is in use liquid will be forced from the exterior to the interior of the ring.

3. In a device of the class described, a; piston with a groove therein, a cylinder and a piston ring loosely mounted in said groove, with means for holding a liquid seal between its ends and forcing liqui ton and piston ring whereby a liquid tight joint between the piston and c linder is pre served at all times.

4. A piston ring with offset converging surfaces which extend continuously and diagonally from the outer to the inner surfaces of the ring with larger openings at the interior than at the exterior so that when the ring is in use, oil will be forced from the exterior to the interior of the ring.

5. A single piece ring having cooperating ends each of which has three continuous and cooperating surfaces, one pair of cooperating surfaces lying substantially in the median plane of the ring, and the other two cooperating surfaces of each end being beveled at different angles so that the open .ing will be wider at the interior than at the exterior whereby oil is forced from the exterlor to the interior of the ring when the ring 1s m use.

ALEXANDER K. SCI-1AA? 

